JPH0769604B2 - Pre-sensitized sheet for color proofing - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to the photomechanical production of multicolor images on a single sheet or substrate without printing. The invention has particular application in proofing color separation negatives prior to multicolor lithographic copying.

BACKGROUND OF THE INVENTION In the printing of paintings, whether by lithographic, letterpress or gravure, the dot method is used, where the actual printed image is of a single color ink of varying dot size or ink density. , Consisting of thousands of micro dots per square inch. What is taken as light and dark in the dot print is actually an adjusted change in dot size relative to the non-printed area between dots. For black and white paintings,
The dots are printed with black ink only. However, full-color reproduction necessarily involves at least three colors: cyan, magenta, and yellow (known as the "three-color method").
Of each color, or with black added ("4 color method"). Separate printing plates are made for each color. To make three or four printing plates, the original color painting or photo is "disassembled" into a set of three or four net negatives using a filter, mask, etc., each net negative being colored. One of which has a dot to get the amount of that color that must be printed.

The production of color separation negatives is a skill and requires considerable skill in handling a large number of variables to achieve a desired result. Often involves trial and error, requiring modification or replacement of one or more negatives. Unless some reliable system for "proofing" the negative is available, the press must be adjusted to make a copy in advance just to get the proof. This is time consuming and expensive. It is therefore desirable to have an accurate means of calibrating a negative without printing.

U.S. Pat. No. 3,136,637 discloses one system for calibrating color separation negatives. A photosensitive transparent sheet is prepared for each color to be printed. Each sheet is exposed via its respective color separation negative. By the developing treatment, the color of the non-image area is removed, and a sheet having a color pattern necessary for the image area and having a colorless and transparent non-image area (for example, between halftone dots) is obtained. After each respective sheet is made, they are aligned and assembled on a white background, resulting in a color proofing sample.

This color proofing system has many inherent drawbacks. For example, stacking multiple sheets requires the observer to view through multiple (3 or 4) transparent films during the calibration operation. Since this composite is composed of a number of separate sheets, extreme care must be taken to maintain alignment. Unless the individual sheets are completely colorless and transparent in the optical sense, some "haze" or existing defects are compounded by several sheets. In addition, incident light reflects off a number of sheets and gives a gloss that is not the true appearance of the print, thus necessitating a comment on the evaluation of the proofreading sample.

U.S. Pat. No. 3,671,236 improves upon the calibration system described in U.S. Pat. No. 3,136,637. The photomechanically created images corresponding to each color are integratedly overlaid on a single substrate (as would the actual printing operation) without any printing operation. 1) a carrier having a release surface, 2) a pigment and binder layer, 3) a photohardening or insolubilizing layer, 4) a barrier layer, and 5) a pressure-sensitive adhesive layer. Transferring individual color images from the sheet eliminates carrier film overlap.

U.S. Patent Application No. 764,246, filed August 9, 1985, is the same image as described in U.S. Patent No. 3,671,236, except that a pressure sensitive adhesive was replaced by a thermal adhesive having certain properties. A forming system is disclosed.

SUMMARY OF THE INVENTION The present invention has at least a carrier having a release surface, a layer of a pigment plus a binder, and a photohardenable layer, and the presence of a pigment that absorbs electromagnetic waves having a sensitivity wavelength of the photohardenable layer. Characteristic,
In particular, the present invention relates to a photosensitive product that is effective for producing a photomechanical calibration sample. Preferably, the system also uses a solvent soluble organic polymer barrier layer and a thermally bondable adhesive layer. The pigment plus binder layer and the photo-hardening layer may be combined.

DETAILED DESCRIPTION OF THE INVENTION The color proofing photosensitive sheet for each of the four colors used in the proofing sample is such that each color proof can be imaged with a single exposure device having a single light source with a relatively narrow band. It tends to be sensitive to a range of imaging electromagnetic waves. The light source of choice for most color proofing systems is ultraviolet light. This causes special problems in color proofing where one of the layers must form a yellow image. Since the yellow pigment absorbs UV light, the exposure time is greatly increased or the speed can reach a practical exposure time when it is present in the light-sensitive layer or between the light-sensitive layer and the UV light source. It may fall to the level at which it disappears. At least 0.6 to give an effective optical density for color proofing
It is not possible to reduce the optical density of the yellow pigment so that it can be passed through by the presence of UV light, since the reflection optical density of

The fine color pigment particles, when used at a concentration sufficient to impart a reflective optical density of at least 1.0, are essentially impermeable to ultraviolet light. Larger pigments are capable of providing an essentially continuous optical density of at least 1.0 in the pigment and binder layer, yet still allow sufficient electromagnetic waves to pass between the particles between the photohardenable binder or underlayer. Expose the photohardenable material. However, particles of that size cause another undesirable problem of color shifting to the red wavelength. This color shift is caused by the internal reflection of the larger surface of the pigment particles in the binder.

Not only can a pigment binder layer having a particular particle size distribution provide the desired permeability (transmittance) for active electromagnetic waves, but it is surprising that either a small particle pigment composition or a large particle pigment composition is used. It has been found according to the present invention that lower total weight pigments can also give a given optical density.

In practicing the present invention, the particle size distribution of the pigment must be selected in relation to the sensitivity of the photosensitive material. Since the electromagnetic wave selected for exposing the most preferred color proofing material for the practice of the present invention is ultraviolet light, the particle size distribution should be selected to minimize scattering of its active electromagnetic wave. Thus, for example, in a system sensitive to 380 nm, less than 40% by volume of the total pigment particles in or on that layer have a particle size within 175 nm of the sensitivity wavelength, and at least 15% by volume of particles or 25% by volume is at least less than the sensitivity wavelength
20 nm larger and at least 15% by volume of particles or 25
The capacity% is required to be at least 20 nm less than the sensitivity wavelength. Preferably, at least 25% by volume of the particles are at least 25 nm greater than the wavelength of maximum sensitivity and 25% of the particles are
The% volume is at least 25 nm less than the wavelength of maximum sensitivity.
In this embodiment at 380 nm, this means less than 40% by volume of the pigment particles have a size in the range of 355-405 nm (.355-.405μ). Preferably 40% by volume of all pigment particles
Less than has a size within 50 nm of the wavelength of maximum sensitivity. Most preferably, less than 25% by volume of all pigment particles have a size within the range of 50 nm from the wavelength of maximum sensitivity. Absolute size is 0.3 ~ when working in UV sensitive system
40% by volume of particle size in the range 0.4μ (geometric mean diameter), preferably 0.3-0.42μ, most preferably 0.25-0.42μ
It is desired to be less than. More preferably, less than 25% by volume of pigment particles within that range is desired.

The exact mechanism by which the benefits of the present invention are achieved is not completely understood, but appears to be related to light scattering of the particles. It is known that the efficiency of light scattering is related to the relative size of the particles and the wavelength of light. The closer the particle size is to the wavelength of the incident electromagnetic wave, the greater the scattering effect. A side effect of scattering is effectively increasing the path of light through the layers. The more light is scattered in the absorbing layer, the more light is absorbed. Therefore, the present invention uses particles that are largely outside the size of the wavelength of the active electromagnetic wave to minimize scattering and absorption. This theory is non-dominant, but has been developed to try to explain phenomena that cannot be predicted from particle size combinations.

Particle size measurements may be made by a number of convenient conventional methods. Even the finished imaging product can be analyzed by standard methods. One convenient method is to dissolve the layer containing the pigment particles in a suitable solvent, thus removing the particles and binder from the product. The binder is already in solution, but if it is further diluted with the same or a different solvent, a settling particle counter (eg Horiba AP
It facilitates the measurement of particle size by statistical or mechanical means such as A500). Prior to inclusion in the layer, the particles may be milled with a resin binder in a diluted state (using a solvent) and coated and dried so that a statistical measurement of the particle distribution can be made.

The types of color proofing structures that best benefit from the practice of the present invention are, in order, at least 1) a carrier having a release surface, 2) a layer of pigment and binder, and 3) photohardening or insolubilizing. It must have a functional layer, or 1) a carrier having a release surface, and 2) a photohardenable layer with a combined pigment and binder. Systems having a pigment and a binder between the carrier and the photohardenable layer do not benefit from the practice of the invention except for the benefit of reduced pigment coating weight. Preferred structures are those described in U.S. Pat. No. 3,671,236 and U.S. Patent Application No. 764,246, filed Aug. 9, 1985, the color proofing sheet of which is 1) a carrier having a release surface and 2) a pigment. And a binder layer, 3) a photocurable or insolubilizing layer, 4) a barrier layer, and 5) a pressure sensitive or thermal adhesive layer.

The use of a thermally bondable adhesive layer rather than a pressure sensitive adhesive layer offers the opportunity of several benefits.
The thermal adhesive layer can be positioned (prior to laminating) and repositioned without the risk of receptive surface modification or foreign object deposition that may occur with the use of the pressure sensitive adhesive layer. The physical properties of the smooth, transparent, optically clear, heat-bondable adhesive layer inherently provide better optical quality than the non-physically smooth pressure sensitive adhesive layer.

Attempts to use thermally bondable adhesive layers in place of the pressure sensitive adhesive layers of US Pat. No. 3,671,236 have encountered significant problems. Among the problems encountered were: 1) Yellowing of the adhesive layer when exposed to active electromagnetic waves, especially UV when imaging the proof sheet, 2) 2g / cm ² at 45 ° C.
Self-bonding of thermal adhesive when stored under pressure, 3) Extreme bonding temperature that aggravates sensitometry of photohardenable layer, 4) Photohardenability by escaping / migrating through barrier layer A component of the thermal adhesive layer that disturbs the sensitivity of the layer, the color of the pigment-containing layer and other optical properties of the layer. Also, many adhesives are unlikely to adhere to the receiving sheet or barrier layer.

In order to use a thermally bondable adhesive layer in a photomechanical calibration product, it was found that the thermal adhesive layer must have the following properties: 1) The adhesive layer is 1.6 lb / in ² (.29kg / c at 100-150 ℃
m ² ) can be thermally laminated at a pressure of 2) the adhesive layer is non-tacky at room temperature or preferably
45 ° C., at 2 g / cm ^2, at least one week is impossible alignment lamination impossible or self alignment bonded to paper, 3) to mainly 5 Kirowatsuto source of ultraviolet radiation having a wave distributed in the range of 350~450nm 1m away from 1
When a 5,000 cm ² area is exposed for 2 minutes, it does not discolor or the optical density does not change more than 0.05 optical density unit, and 4) the barrier layer is formed by itself or in combination with the solvent for the adhesive layer. It contains no components that migrate through and desensitize the photohardenable layer, change the color or tone of the pigment, or change the optical quality of the barrier layer or photosensitive layer.

The adhesive layer must also adhere strongly to the barrier layer, and the bond strength between the layers should be such that there is a moderate bond strength between the release layer and either the pigment-containing binder layer or the carrier layer. Surpass.

The above properties of non-discoloration reflect the usual imagewise exposure conditions for this product. Thus, the element should not discolor (at any wavelength) or have an optical density change of no more than 0.05 optical density units when exposed to the normal levels of exposure required to image a diazo resin. Exposure at 417 nm (ie, exposure electromagnetic waves with a peak power at about 417 nm) is currently common in the industry, but other maximum power wavelengths are acceptable. The sheet should not discolor when exposed to electromagnetic waves sufficient to allow visualization by activation of the diazo resin.

In general, the structure of the present invention has a carrier sheet provided with a release surface which may be the smooth surface of the carrier itself or a surface coating thereon. A color coating (e.g., composed of a colored organophilic water-insoluble solvent softening resinous polymer) is provided on the surface of the color coating which is in close contact with it but is not adhesively bonded thereto. A photosensitive diazo resin layer is coated over the color coating in contact therewith. The color coating and the photosensitive layer are intimately associated and adhesively bonded (in some cases, the structure may actually be combined into a single layer). The photosensitive layer is soluble in a solution that softens and / or partially dissolves the color coating.

A continuous solvent resistant resinous protective film or barrier layer is provided on the photosensitive layer. The bare surface of the barrier layer is provided with a layer of adhesive that can be thermally laminated. Preferably, the adhesive layer has a thickness of ^{0.1 × 10 -4 cm~20 × 10 -4} cm. The outer surface of the adhesive may optionally be protected from dust and grease stains by a protective release liner.

To apply this structure to a substrate such as blank paper, first,
After peeling the protective liner from the adhesive surface, the entire structure is laminated to the substrate, eg, by a heated roll.
The carrier sheet is then peeled from this structure because the bond strength with the paper and the adhesive force between several layers is greater than the non-adhesive adhesion between the carrier sheet and the color coating or release layer. After removal of the carrier, the remaining structure, which is now bonded to the substrate, is exposed to ultraviolet light through a suitable color separation negative that corresponds to the color of the particular coating. In the light irradiator, ultraviolet light passes through the color coating (which is transparent thereto) to insolubilize the photosensitive material. A firm bond occurs between the photoreacted material and the coating layers below and above it.
The adjacent non-exposed areas remain photosensitive.

The sheet is then treated with a development solvent (which contains the solvent for the unexposed diazo) selected in relation to the particular material that comprises the color coating layer and developed. The color coating and photographic material in the non-irradiated areas are removed, leaving a fixed color image in the barrier layer below by the photoreactive diazo in the exposed areas. During the development process, the barrier layer acts as a barrier that protects the substrate (and adhesive) from the solution used in the process.

It has been found that the preferred thermal adhesive system is limited to a narrow class of available thermal adhesives. It has been found that only acrylate polymer and copolymer thermal adhesives with a laminating temperature of 100-150 ° C. for 5-10 seconds at a pressure of 0.29 kg / cm ² fulfill all the requirements of thermal adhesives. Copolymerization with n-butyl acrylate, ethyl acrylate, isopropyl acrylate polymers, and their ethylenically unsaturated monomers (for example, other acrylates, acrylic anhydride, acrylic acid, methacrylic acid, styrene, vinyl acetate, etc.) Coalescence is the only adhesive that meets all the requirements of a thermal adhesive. Monomers that cause yellowing or discoloration of the final adhesive when the sheet (eg, 15,000 cm ² ) is exposed to a 5 kW light source of UV light at about 417 nm peak for 2 minutes from 1 m away should be avoided. A change in optical density of 0.1 (possibly even a change of 0.05) is considered an unacceptable discoloration. Since acrylonitrile and vinylidene chloride tend to cause yellowing in copolymerizable ethylenically unsaturated substances such as vinyl chloride, if used, less than 10% of the total dry weight of the adhesive component when used. Must be used in an amount (preferably less than 5%). Preferred compositions are poly (n-butyl acrylate / ethyl acrylate) (60/40), poly (ethyl acrylate / styrene) (64/36), poly (n-butyl acrylate), poly (styrene / n-butyl acrylate / acrylic Acid / acrylonitrile) (45/45/8/2), poly (n-butyl acrylate / vinyl acetate) (80/20) and the like.

I have tried numerous other thermal adhesive systems, but all others have been disqualified for various reasons.

After the first color image, such as cyan (blue), is photomechanically created on the substrate, similar sheets with yellow, magenta, and black color coatings are sequentially applied to obtain a four color swatch.

These and other features of the invention will now be illustrated by way of non-limiting examples.

EXAMPLE A 2 mil film of a smooth surface biaxially oriented polyethylene terephthalate polyester was first coated with a solution of polyvinyl alcohol having the following composition: wt% polyvinyl alcohol (commercial as Gerbatol 20-30 / Gerbatol 20-90 (3/1)). 2.5 glycerin 0.5 water 97 dry coverage of 75 mg / ft ² provided a satisfactory release surface. The release layer surface was oven dried and then coated with a resin solution containing the appropriate yellow pigment.

This coating solution was prepared as follows: First, 1,1,
The pigment was dispersed in a 2-trichloroethane solution and polyvinyl formal resin (Formval 15 / 95E) was added. The amount of each component was adjusted to give a mixture of 65 parts resin, 35 parts pigment and 900 parts solvent. This mixture was milled appropriately. The resulting milled base was then diluted by adding more solvent to about 3% solids. This pigmented resin coating solution or dispersion was applied over the dry release layer at a dry coating weight of about 20-70 mg per square foot. The coated sheet structure was oven dried as previously to evaporate the solvent.

The polyvinyl formal coated surface of this sheet was then primed by corona discharge treatment, sufficient to render the film surface water-wettable.

This prepared surface of the sheet was then coated with a solution or equivalent of a photosensitive diazo resin. A preferred diazo resin is the condensation product of p-diazodiphenylamine and formaldehyde (made, for example, by the method described in US Pat. No. 2,714,066). A solution of neat diazo resin (eg, 4 parts resin dissolved in 48 parts water and 12 parts methanol) is prepared.

The photosensitive diazo resin is manufactured under soft light (for example, under yellow light). This is also the case for other operations, including covering the sheet with a photosensitive resin and then handling the sensitized sheet prior to exposure and development.

The above solution of photosensitive diazo resin can be applied by roll coating on the pretreated polyvinyl formal layer or by dipping the sheet in the solution of resin. The diazo coating is preferably thin and about 6-8 mg diazo resin residue per square foot area is satisfactory, although the actual amount is not critical and 3-50 mg / ft ² is effective.
The sheet was then air dried at room temperature or slightly higher if desired. A barrier on top of the diazo layer, for example polyacrylate in methyl ethyl ketone ("ervasite
2044 ") / Polyvinyl chloride / vinyl acetate copolymer (" Vinylite VAG
H ”) in a 3/1 weight ratio of a 2 wt% solution in a dry coating amount of 160 mg / ft ²
Applied by coating (generally a coverage of 100-400 mg / ft ² is preferred).

A clear colorless thermally bondable adhesive was coated on the acrylate surface at a dry coverage of 800 mg / ft. After drying
Although not required, a polyethylene coated paper protective liner may be placed over the adhesive to facilitate handling of the sheet and to protect the adhesive from dirt and the like. The photosensitive sheet of this form can then be standardized and placed in a suitable container for market. Adhesives can also be coated in large amounts, with a typical range of about 10
It is 0 to 1200 mg / ft ² .

In the following examples, a poly (n-butyl acrylate / ethyl acrylate) (60/40) copolymer was used as the thermal adhesive.

Yellow pigment [AAOA] with an average particle size of 0.51μ and average particles
Child size 0.11μ yellow pigment [AAOT]
Samples are blue-filled with a reflection densitometer (X-light)
The Meyer bar to give a density of 1.08 at the target position.
Coated. These coated samples are sequentially placed on the optical filter.
Use as a stair with a tablet
Negative Color Key Exposed. Relative dew after development
Pay attention to the light time, and 2 solid steps for each proportion of pigment
The number of exposure units needed to image the floor was calculated.
And if we show a 50% reduction in exposure time,
High amount of AAOT opaque pigment (10%) reduces exposure time by half
It was amazing that we were able to reduce it. this
In order to better understand that it has a phenomenon,
The transmission data for some of the tsuku During ~
Due to the relative photosensitivity of the diazo present in
・ Measurement with transmission data of status T filter
did. These data show the energy transmission of these two pigments.
It has been shown that there is a large difference in excess rates; eg 100% AAO
A transmits less than 0.1% of 380 nm UV energy
However, 100% AAOT transmits about 25% of the same energy.
It Intermediate values (75% AOAA / 25% AAOT) as well as intermediate transparency
Indicates an excessive rate. Transmission for further analysis of these data
The rate data was converted to absorption rate.

The rate data was converted to absorbance and shown in the following table. In the table
In the case of 100% AAOA, as shown in
, While the transparency expressed by the absorbance is 1.89,
And if 10% AAOT is introduced, it will be 1.49
This means that the UV transparency has increased.
This allows the UV-sensitive color key During exposure
The interval can be reduced by half as explained above.
It is.

The fact that the effect of increasing the effective covering power of a pigment (“enlarging”) is caused by the scattering of light in the visible region is supported by the present practical hypothesis. It is believed possible to reduce transmission in the visible region while still effectively increasing transmission in the ultraviolet as evidenced by exposure to shorter wavelengths. This is because different electromagnetic wave wavelengths are affected differently by particle size.

The data then shows a large effect of the pigment composition on the transparency expressed in absorbance to UV light and a small effect on the visible hue.

The economic advantages of the present invention are 1) use of a wide range of pigments, 2)
Reduction of the coating weight of the pigment, 3) achievement of color control by changing the hue of the pigment, and so on.

The yellow color proof sheet has been described above, but companion magenta, cyan, and black structures (these compose a complete four-color proof system together with the yellow sheet).
Similarly, using the same polyvinyl formal resin coating, but with a pigment of a suitable color and particle size, for example, "Watsujung Red RT761-D", "Monastral Bull-BT284-D" (phthalocyanine pigment), cabbot Made by incorporating "Regal 300R" carbon black. The choice of pigment and the setting of the pigment / resin ratio are generally made to give the same color density as would be obtained from the corresponding color printing ink used in the proofed print. These sheets can be stored in a state in which the photosensitive layer has been previously coated, and can be used after a few weeks or months as they were immediately after production. Any desired substrate can be used to make the color proofing composite using this sheet.

In the production of the color proofing complex, the colors are processed individually. The sheet of color (eg yellow) represented by the first negative to be calibrated is prepared for processing by removing the adhesive protection sheet and laminating the color sheet to the background sheet. It The pressure applied by a conventional laminating device with a heating roller is sufficient to carry out the laminating via a thermally laminating adhesive. After laminating, the support sheet of polyethylene terephthalate is peeled off. The photosensitive layer now on the background sheet is contact exposed via the corresponding color separation negative.

The photoimaged sheet is then physically developed with a solution of n-propanol / water (1/1 volume ratio), brushed, and wiped with a soft cloth pad to remove the colored resin from the non-image area (non-exposed area). And the unexposed sensitizer layer is removed to make it colorless and transparent. Thereby, an image emerges, which is the reproduction and full color gamut that would have been obtained if a complete plate making and printing operation (using compatible inks) was carried out with its color separation negative. Is faithfully represented.

A sheet of a second color, preferably magenta, to be calibrated is similarly prepared for processing by removing the adhesive protection sheet and laminating it to the previous yellow imaged background sheet. It The corresponding color separation negative must now be placed in exact alignment with the yellow image. This is usually possible by pre-aligning the entire disassembly negative with the background sheet by a system of registration marks or punches. The photosensitive layer now placed on the yellow imaged background sheet is exposed and developed in the same manner as the first color. The remaining cyan and black images are then added sequentially, thus faithfully representing the four-color result that would be obtained if printed using a plate made from the same color separation negative.

There is a particular and essential relationship between the elements of the above structure. The adhesive relationship must be such that the carrier layer can be peeled off after breaking the adhesive bond to the background sheet without breaking the adhesive bond. No damage should occur to the bond between the adhesive and the background sheet or the bond between the adhesive and the barrier layer. It is not particularly critical whether peeling occurs between the carrier layer and the peeling layer or between the peeling layer and the color layer, but peeling occurs between the two layers formed during the manufacturing process of the structure. Delamination between the carrier layer and the release layer is somewhat more likely to occur since it is generally less efficient. In this case, it is important that the release layer be transparent and soluble in the developer.

Reference is also made to U.S. Pat. No. 3,136,637 regarding color coating resins and solutions used for development, in which a number of organophilic hydrophobic water-insoluble solvent softening resinous polymers are disclosed, along with suitable developers. Has been done. There, a solid bond was formed in situ between the resin and the diazo in the light-irradiated area due to the exposure of the structure, and light-rubbing with an appropriate developing solution was performed in the unexposed area. Therefore, it is stated that the resin can be removed.

As long as the photosensitive layer is extremely thin and discontinuous, the relationship between the color coating and the barrier layer is important because they are in contact with each other in the structure. The bond (or any mixing that occurs at the interface) formed between the two should not interfere with the removal of the color coating in the unexposed areas during development. As noted above, whatever natural bonds are present, they are strengthened in situ by the photoreaction of the diazo to give strong bonds that prevent their removal during development. It has been found that there is a desirable relationship between the resins that make up the color layer and the resins that make up the barrier layer, provided there is at least some physical incompatibility.

In the coating operation, best results are obtained when the subsequently applied layer is cast from a solvent that does not dissolve the previous layer.

In the above examples, the color coating and diazo resin were applied from different solvents in separate steps.

Claims (13)

[Claims] 1. A carrier sheet having a release surface, and a yellow-colored organophilic hydrophobic resin that is in close contact with the release surface but is not adhesively bonded to it and is soft and / or partially soluble in a solvent developing medium. A continuous color coating of a water-insoluble resinous polymer and a layer, directly combined with the color coating, which is soluble in the solvent development medium and comprises a UV-sensitive diazo resin,
The direct combination is: (a) incorporating the diazo resin into a color coating into a single layer; and (b) the diazo resin separate from but adjacent to the color coating layer and the color coating. At least one of a layer containing the UV-sensitive diazo resin, and optionally a layer containing the UV-sensitive diazo resin. And a barrier layer adjacent to the color proofing sheet, wherein the diazo resin becomes insoluble in the light-exposed portion when the sheet is exposed, and the color layer becomes the barrier layer or The color layer and the diazo resin can be easily removed from the barrier layer in the non-exposed area by firmly bonding to an adjacent layer other than the release surface, and the presensitized sheet can be further formed on the color coating layer. The color coating layer contains a binder layer, the color coating layer has a yellow pigment that absorbs electromagnetic waves sensed by the diazo resin, and the particles of the yellow pigment in the color coating layer account for less than 40% of the yellow pigment particles by the UV exposure. Having a size within 175 nm of the wavelength of maximum sensitivity of the diazo resin and at least 15% by volume of the yellow pigment particles is at least 20 nm greater than the wavelength of maximum sensitivity and at least 15% by volume of the yellow pigment particles are At least 20 nm from the wavelength of maximum sensitivity
Pre-sensitized seat characterized by its small size. 2. The presensitized resin composition according to claim 1, wherein the color coating and the diazo resin are adjacent layers.
Sheet. 3. A presensitized sheet according to claim 1, wherein the color coating and the UV-sensitive diazo resin are mixed to form a single layer. 4. A presensitized sheet according to claim 1, wherein said color coating is a yellow colored polyvinyl formal resin. 5. The presensitized sheet of claim 2 having a release liner bonded to the adhesive layer. 6. The presensitization of claim 1, claim 2 or claim 3 wherein the adhesive comprises poly (n-butyl acrylate) or a copolymer of n-butyl acrylate. De seat. 7. The adhesive comprises poly (ethyl acrylate) or a copolymer of ethyl acrylate,
The pre-sensitized seat according to claim 1. 8. The presensitized sheet of claim 1, wherein less than 40% by volume of the yellow pigment has a size within 50 nm of the wavelength of maximum sensitivity of the UV-sensitive diazo resin. 9. The presensitized sheet of claim 2 wherein less than 40% by volume of the yellow pigment has a size within 50 nm of the wavelength of maximum sensitivity of the UV-sensitive diazo resin. 10. The ultraviolet-sensitive diazo resin is 300 to 400 nm.
The electromagnetic field within the range of 0.1 and the particle size distribution of the yellow pigment is such that less than 40% by volume of the yellow pigment has a size of 0.25 to 0.42μ. Sensitized seat. 11. The adhesive comprises at least one acrylate selected from the group consisting of n-butyl acrylate and ethyl acrylate, styrene, acrylic acid,
10. A copolymer derived from at least one ethylenically unsaturated monomer selected from the group consisting of methacrylic acid, acrylic acid anhydride and vinyl acetate. 10 sensitized seats. 12. A carrier sheet having a release surface, and a yellow-colored organophilic hydrophobic resin that is in close contact with the release surface but is not adhesively bonded to the solvent development medium and is soft and / or partially soluble. A continuous color coating of a water-insoluble resinous polymer and a UV-sensitive diazo resin soluble in the solvent development medium, directly combined with the color coating, the direct combination comprising: Incorporating the diazo resin into the color coating into a single layer; and (b) incorporating the diazo resin into a layer separate from but adjacent to the color coating layer; An ultraviolet-sensitive diazo resin and a continuous water-insoluble transparent colorless barrier layer insoluble in the solvent developing medium, which is bonded onto the color coating and one surface of the diazo resin. A presensitized sheet for color proofing comprising a diazo resin which becomes insoluble in the light-irradiated portion when the sheet is exposed to firmly bond the color layer to the barrier layer and in the unexposed portion. The color layer and the cyazo resin are easily removable from the barrier layer, and the presensitized sheet further comprises 10 above the barrier layer at a pressure of 0.29 kg / cm ² at a temperature of 100-150 ° C. It can be pasted in seconds, it is non-adhesive at room temperature, and the main part of electromagnetic waves
Does not discolor when exposed for 2 minutes to an area of 15,000 cm ² from a distance of 1 m from an ultraviolet ray of 5 kilowatts distributed in the range of 350 to 450 nm or its optical density is 0.05.
It does not displace the optical density unit, and contains a component that migrates through the barrier layer to desensitize the diazo resin, discolor the yellow pigment, or disturb the optical properties of other layers. A thermally bondable adhesive layer consisting essentially of at least one acrylic polymer or copolymer layer, wherein the yellow pigment particles in the color coating layer are the yellow Less than 40% of the pigment particles have a size within 175 nm of the wavelength of maximum sensitivity of the UV-sensitive diazo resin, and at least 25% by volume of the yellow pigment particles are at least greater than the wavelength of maximum sensitivity.
25 nm larger and at least 25% by volume of the yellow pigment particles
A presensitized sheet characterized in that is at least 25 nm less than the wavelength of maximum sensitivity. 13. The polymer or copolymer is poly (n-
Butyl acrylate) or poly (ethyl acrylate) or a copolymer thereof with at least one ethylenically unsaturated comonomer selected from the group consisting of styrene, acrylic acid, methacrylic acid, acrylic acid anhydride and vinyl acetate. And the color coating and the structure of the diazo resin are adjacent layers, or the color coating material and the UV-sensitive diazo resin are mixed to form a single layer. Presensitized seat in Section 12.